Either with your project selected in Project Library view, or with your Trailer open, from the menu select File>Convert to Project. Now the Trailer will look like a standard project where you can perform whatever edits you prefer, including inserting stills. But be careful not to disturb the timing, otherwise the music will not synchronize with the video clips. The music is timed perfectly to match changes in the clips and titles.

TIP: It's best to duplicate the Trailer before converting it, just in case you wish to go back to the original Trailer format. To duplicate, select the Trailer in Project Library view (but don't open it), then from the menu choose File>Duplicate Project. You can also right-click (or control-click) on the project and select Duplicate Project from the pop-up menu.

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